2D MXenes are highly attractive for fabricating high-precision gas sensors operated at room temperature(RT)due to their high surface-to-volume ratio.However,the limited selectivity and low sensitivity are still long-s...2D MXenes are highly attractive for fabricating high-precision gas sensors operated at room temperature(RT)due to their high surface-to-volume ratio.However,the limited selectivity and low sensitivity are still long-standing challenges for their further applications.Herein,the self-assembly of 0D-2D heterostructure for highly sensitive NO_(2) detection was achieved by integrating ZnO nanoparticles on Ti_(3)C_(2)Tx MXene-derived TiO_(2) nanosheets(designated as ZnO@MTiO_(2)).ZnO nanoparticles can not only act as spacers to prevent the restacking of MTiO_(2) nanosheets and ensure effective transfer for gas molecules,but also enhance the sensitivity of the sensor the through trapping effect on electrons.Meanwhile,MTiO_(2) nanosheets facilitate gas diffusion for rapid sensor response.Benefiting from the synergistic effect of individual components,the ZnO@MTiO_(2)0D-2D heterostructure-based sensors revealed remarkable sensitivity and excellent selectivity to low concentration NO_(2) at RT.This work may facilitate the sensing application of MXene derivative and provide a new avenue for the development of high-performance gas sensors in safety assurance and environmental monitoring.展开更多
利用结构仿生学的思想,以新鲜番薯叶为模板,利用浸渍-煅烧两步法成功制备出一系列叶片状的TiO_(2)/ZnO复合材料。利用SEM、XPS、XRD、BET等对复合材料进行表征。结果表明,复合材料由锐钛矿相TiO_(2)和纤锌矿相ZnO组成,保持了番薯叶片的...利用结构仿生学的思想,以新鲜番薯叶为模板,利用浸渍-煅烧两步法成功制备出一系列叶片状的TiO_(2)/ZnO复合材料。利用SEM、XPS、XRD、BET等对复合材料进行表征。结果表明,复合材料由锐钛矿相TiO_(2)和纤锌矿相ZnO组成,保持了番薯叶片的多级复杂结构,具有介孔结构。光催化实验表明,TiO_(2)·6 h ZnO表现出最优的光催化性能。在室温下光照90 min, TiO_(2)·6 h ZnO对胭脂红水溶液的降解率可达到92.65%;动力学分析表明,TiO_(2)·x h ZnO复合材料对胭脂红溶液的降解反应均符合一级动力学模型。展开更多
基金supported by the National Natural Science Foundation of China(No.52103308)the Natural Science Foundation of Jiangsu Province of China(No.BK20210826)+4 种基金Outstanding Youth Foundation of Jiangsu Province of China(No.BK20211548)National Key Research and Development Program of China(No.2017YFE0115900)Innovative Science and Technology Platform Project of Cooperation between Yangzhou City and Yangzhou University(No.YZ2020266)Lvyang Jinfeng Plan for Excellent Doctor of Yangzhou City,Special Funds for Self-Made Experimental Equipment of Yangzhou Universitythe Doctor of Suzhou University Scientific Research Foundation Project(No.2022BSK003).
文摘2D MXenes are highly attractive for fabricating high-precision gas sensors operated at room temperature(RT)due to their high surface-to-volume ratio.However,the limited selectivity and low sensitivity are still long-standing challenges for their further applications.Herein,the self-assembly of 0D-2D heterostructure for highly sensitive NO_(2) detection was achieved by integrating ZnO nanoparticles on Ti_(3)C_(2)Tx MXene-derived TiO_(2) nanosheets(designated as ZnO@MTiO_(2)).ZnO nanoparticles can not only act as spacers to prevent the restacking of MTiO_(2) nanosheets and ensure effective transfer for gas molecules,but also enhance the sensitivity of the sensor the through trapping effect on electrons.Meanwhile,MTiO_(2) nanosheets facilitate gas diffusion for rapid sensor response.Benefiting from the synergistic effect of individual components,the ZnO@MTiO_(2)0D-2D heterostructure-based sensors revealed remarkable sensitivity and excellent selectivity to low concentration NO_(2) at RT.This work may facilitate the sensing application of MXene derivative and provide a new avenue for the development of high-performance gas sensors in safety assurance and environmental monitoring.
文摘利用结构仿生学的思想,以新鲜番薯叶为模板,利用浸渍-煅烧两步法成功制备出一系列叶片状的TiO_(2)/ZnO复合材料。利用SEM、XPS、XRD、BET等对复合材料进行表征。结果表明,复合材料由锐钛矿相TiO_(2)和纤锌矿相ZnO组成,保持了番薯叶片的多级复杂结构,具有介孔结构。光催化实验表明,TiO_(2)·6 h ZnO表现出最优的光催化性能。在室温下光照90 min, TiO_(2)·6 h ZnO对胭脂红水溶液的降解率可达到92.65%;动力学分析表明,TiO_(2)·x h ZnO复合材料对胭脂红溶液的降解反应均符合一级动力学模型。
